Refactor prepare_pt2, prepare_traced_pt2

[mcr229]

Summary:
Refactor prepare_pt2 to wrap trace and prepare_traced_pt2
prepare_traced_pt2 will wrap prepare_pt2e and log outputs

Reviewed By: mcremon-meta, skrtskrtfb

Differential Revision: D78762534

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This pull request was exported from Phabricator. Differential Revision: D78762534

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